Across
- 3. Tiny air sacs in lungs
- 4. System that fights illness
- 5. Filters blood
- 7. Main organ of the nervous system
- 9. Tube for food to stomach
- 12. System for breathing
- 15. Connects bones together
Down
- 1. Basic unit of life
- 2. Breaks down food
- 6. System that controls the body
- 8. Organ that pumps blood
- 10. Makes hormones
- 11. Red liquid in veins
- 13. Organ that controls sugar
- 14. Gas you breathe in